Grease gun



FIG. 1 is a front perspective view of a design of a grease gun;

FIG. 2 is a front elevation view of the grease gun of FIG. 1;

FIG. 3 is a rear elevation view of the grease gun of FIG. 1;

FIG. 4 is a first side elevation view of the grease gun of FIG. 1;

FIG. 5 is a second side elevation view of the grease gun of FIG. 1;

FIG. 6 is a top plan view of the grease gun of FIG. 1; and,

FIG. 7 is a bottom plan view of the grease gun of FIG. 1.

The broken lines shown in the figures are for the purpose of illustrating portions of the grease gun that form no part of the claimed design. 

CLAIM The ornamental design for a grease gun, as shown and described. 